<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <style>
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            line-height: 1.6;
            color: #2c3e50;
            max-width: 600px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f8f9fa;
        }
        .container {
            background-color: #ffffff;
            border-radius: 8px;
            padding: 30px;
            margin-top: 20px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        .header {
            text-align: center;
            margin-bottom: 30px;
        }
        .header h2 {
            color: #1a73e8;
            margin: 0;
            font-size: 24px;
        }
        .content {
            color: #5f6368;
            text-align: center;
            margin: 20px 0;
        }
        .highlight {
            font-size: 20px;
            color: #1a73e8;
            margin: 25px 0;
        }
        .footer {
            margin-top: 30px;
            padding-top: 20px;
            border-top: 1px solid #e0e0e0;
            font-size: 12px;
            color: #5f6368;
            text-align: center;
        }
        @media (max-width: 480px) {
            body {
                padding: 10px;
            }
            .container {
                padding: 20px;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <h2>欢迎加入 {{ project_name }}</h2>
        </div>
        
        <div class="content">
            <p>亲爱的 {{ username }}：</p>
            
            <p class="highlight">感谢您注册 {{ project_name }}！</p>
            
            <p>我们很高兴您能加入我们。</p>
            <p>如果您有任何问题或需要帮助，请随时联系我们的客服团队。</p>
            
            <p>祝您使用愉快！</p>
        </div>

        <div class="footer">
            <p>此邮件由系统自动发送，请勿回复</p>
            <p>© {{ year|default(2024) }} {{ company_name|default('Your Company') }}. All rights reserved.</p>
        </div>
    </div>
</body>
</html> 